​Resolution:

This could be because the file has been removed, according to our retention policies defined in KB005063. You may need to upload your PST file again.

This could happen if you uploaded PST files to one PST BitTitan Storage project, and then moved the migrations to a diffe​rent PST BitTitan Storage project. This is because the container name is not the same between the two projects. Move the migrations back to the original project.

If you are using your own Azure account, verify that the file is still present in your account.

File names in Azure are case-sensitive, and must be an exact match to the PST Path in ​MigrationWiz.